Gravity Wave/large-Scale Flow Interactions: A Comparison of Model Predication and Observation
Herman, Redina Lee
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https://hdl.handle.net/2142/85958
Description
Title
Gravity Wave/large-Scale Flow Interactions: A Comparison of Model Predication and Observation
Author(s)
Herman, Redina Lee
Issue Date
2003
Doctoral Committee Chair(s)
Robinson, Walter A.
Department of Study
Atmospheric Sciences
Discipline
Atmospheric Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Atmospheric Science
Language
eng
Abstract
These observed interaction signatures are then compared to the interaction signatures predicted by three commonly used gravity-wave parameterizations: critical level filtering, linear saturation filtering, and diffusive filtering. A one-dimensional, time-independent model filters various gravity-wave spectra using the criteria for each of these parameterizations. Background wind profiles for different times during the large-scale flow event are used to obtain filtered gravity-wave activity signatures that vary over time. In order to reproduce the observed interaction signature for both large-scale flow events, a broad spectrum released at 55 km was needed. These model results would indicate that the gravity waves that reach the mesosphere do not propagate from the troposphere, but are generated more locally.
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